直接调用default的信息:
    @foreach($errors->all() as $k => $v)
        {{$v}}
        @endforeach
<hr>
笨方法调用default的信息:
@foreach($errors->default->all() as $k => $v)
    {{$v}}
@endforeach
<hr>
getBag调用default的信息:
@foreach($errors->getBag('default')->all() as $k => $v)
    {{$v}}
@endforeach
<hr>
调用所有错误的信息:
@foreach($errors->getBags() as $k => $v)
    @foreach($v->all() as $value)
        {{$value}}
        @endforeach
@endforeach

<hr>

@empty($msg)
    no msg
    @endempty

<hr>
<form action="{{url("/laravel/response/back/myWithInput")}}">
    <input type="text" name="test" value="123">
    <input type="submit">

</form>